package com.hmdp.utils;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {
    //2024-1-1 00:00:00
    private static final long BEGIN_TIMESTAMP = 1704067200L;

    //序列号位数
    private static final int COUNT_BITS = 32;

    @Autowired
    private StringRedisTemplate redisTemplate;

    public long nextId(String keyPrefix) {
        //1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timeStamp = nowSecond - BEGIN_TIMESTAMP;
        //2.生成序列号
        //2.1 获取当前日期
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        //2.2 自增长
        long count = redisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);
        //拼接并返回
        return (timeStamp << COUNT_BITS) | count;
    }

    public static void main(String[] args) {
        LocalDateTime time = LocalDateTime.of(2024, 1, 1, 0, 0, 0);
        long second = time.toEpochSecond(ZoneOffset.UTC);
        System.out.println(second);
    }
}
